Paper pulp container



' Patented May 12, 193

1,so4,sss

A-- I F ICE .150 GENTILE, F OHIGAGQ, ILLINOIS, ASSIGNOR OF ONE-HALF 10SAMUEL W.

ms, 01* CHICAGO, ILLINOIS rarnn rum conramnn No Drawing.

This invention relates to paper pulp containers, such as pails, cans,and the like, designed for packaging and shipment of various articles ofmerchandise, and more par- 5 ticularly, food products containingmoisture or grease or both.

The principal object of the invention is to produce a thoroughlypractical and inexpensive container of paper pulp or other fibroussubstance that will be both water and grease proof.

Paper pulp pails and cans have heretofore been interiorly coated withparafiine with a view to rendering them water-proof, and

it they have also been coated with sodium silicate to render themgrease-proof; A paraffine coating, however, is not grease-proof, nor isa sodium silicate coating water-proof. I have found that a pulpcontainer may be 24 rendered grease-proof by coating it with animal orvegetable glue, and it may also be rendered water-proof by applyin tothe surface of the glue coating'a very t in coating comprising asolution of cellulose ester, such 25 as cellulose-acetate ornitro-cellulose.

' Such a cellulose coating is water proof and also, when of substantialthickness, grease proof, but is very expensive; hence, to lower thecost, I propose to utilize a gelatin coating to insure the property ofimperviousness to grease and oils, and to employ thereon a thin coatingof acellulose ester to prevent access of moisture to the gelatincoating.

Accordingly, in preparing-the article, I take an ordinary paper pulp orother fibrous 1 can, pail or the like, and apply, preferably to theinterior surface thereof, a relatively thick coating of gelatin, eitheran anmial gelatin such as animal glue, or a Vegetable coating such asstarch or dextrin. This coating may be applied in any of the well-knownways, such as dipping, brushing or spraying. When the gelatin coating isthoroughly dry, I then apply to the surface thereof a thin coating of asolution of a cellulose ester, for example, cellulose-acetate ornitro-cellulose, permitting the same to thoroughly dry. This water-proofcoating of a cellulose ester maylikewise be applied in any of the knownways,

Application filed October 20, 1928. Serial No. $13,952.

hold of and adhere strongly to the underlying I gelatin coating.

By the foregoing process of treating, a

pulp container, I provide a universal container for all substances,solid or liquid, hot or cold, containing either moisture, or oil orgrease, or both, which will not permit the contents to seep through thewalls of the container.

I claim:

1'. A paper pulp receptacle impervious to hot and cold substances thatcontain water, oil or grease, the said receptacle having a coating ofgelatin applied to the paper and over the gelatin havm a coating ofcellulose ester containing a mo lfying agent to render the said coatinglayers strongly adherent to each other.

2. A paper pulp receptacle impervious to hot and cold substances thatcontain water, oil or grease, the said receptacle having a coating ofgelatin applied to the paper and over the gelatine having a relativelythin coating of cellulose ester containing a modifying agent to renderthe coating layers strongly adherent to each other.

MARINO GENTILE.

